000			04096nas|a2200433 i 4500
005			20260818143539.0
008			160399s1991 th uzm rtt 00| a1eng d
035			_a.b10366325
099		9	_aAIT Thesis no.EV-91-5
100	1		_aHsu, Ta-lin
245	1	0	_aIntegrated system for urban sewage treatment (biodisc, activated sludge and water hyacinth)
260			_aBangkok : _bAsian Institute of Technology, _c1991
300			_a90 p.
490	1		_aThesis ; _vno. EV-91-5
500			_aA thesis study submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1991
520			_aThe present paper reported herein was conducted to study the sources and characteristics of an important urban sewage source, an office wastewater and to evaluate a treatment process consisting of integrated system of BIODISC,ACTIVATED SLUDGE AND WATER HYACINTH. Major wastewater sources were domestic wastewater from office building. The pattern of the wastewater flows was found to be high variable on hourly basis and wastewater quality was classified as to be high nutrient BOD:N:P = 84:23:1. The combined wastewater had an average BOD value of 225 mg/l, COD of 418 mg/l, SS of 151 mg/l. The treatment process of combined Biodisc, Activated Sludge and water hyacinths has been studied in full scale plant. This system consisted of completely mixed biological treatment tank. In which suspended solids were kept in suspension by the rotating drum. The aeration drum was a wheel with pipe with plastic plate inside served as support material for attached growth. The supply of oxygen for the microorganism film and suspended microorganism by rotating the pipe-wheel. In this treatment process, 71 and 90 percent of SCOD and SBOD could be removed, respectively. partial nitrification also be found in bio-tank. It has been demonstrated that the first order specific SBOD removal rate (k) is about 0.037 l/mg VSS.day. In this study, there are some weakness of designing in this treatment plant to be found. (1) aeration disturb settling. ( 2 ) short circuit of raw sewage into settling. (3) shock hydraulic load due to oversize dosing pump and no suitable equalization. In summary, this treatment process is acceptable. The k value are normal in compare to with other activated sludge process. The concentration of oxygen in mixed liquor presented more than adequate. On the maintenance and operational standpoint, this integrated system is no more complex than other activated sludge system and operator attention requirements were minimal. secondly, due to floating force caused by captured air, the mechanical loading was reduced and energy would be saved.
650		0	_aSewage _xPurification _xBiological treatment
650		0	_aSewage _xPurification _xActivated sludge process
700	0		_aSamorn Muttamara, _eChairperson
700	0		_aChongrak Polprasert, _eExamination Committee
700	0		_aKasemsun Suwarnarat, _eExamination committee
710	2		_aBES Engineering Corporation Taiwan, Rep. of China, _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. EV-91-5
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B17393
907			_a.b10366325 _bmnait _cx
902			_a240402
998			_b2 _c951012 _dm _ea _fx _g0
945			_lmnait
945			_lmnait
945			_lmnarc
942			_c22
942			_c40
942			_c20
909			_aBarcode : 30050120124622 _bCREATED : 2014-03-28 _cRECORD # : i12781484 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
909			_aBarcode : 30050120222673 _bCREATED : 2016-11-05 _cRECORD # : i1297433x _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
909			_aBarcode : 30050121074453 _bCREATED : 2023-03-23 _cRECORD # : i13440329 _dLPATRON : 0 _eLCHKIN : - _f# RENEWALS : 0 _g# OVERDUE : 0 _hIUSE3 : 0 _iTOT CHKOUT : 0 _jTOT RENEW : 0
999			_c61580 _d61580